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发明名称
Road guide
摘要
申请公布号
US1997342(A)
申请公布日期
1935.04.09
申请号
US19340705112
申请日期
1934.01.03
申请人
PETTIT HAROLD O
发明人
PETTIT HAROLD O.
分类号
G09B29/06
主分类号
G09B29/06
代理机构
代理人
主权项
地址
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